API Docs for: 5.4.0-beta.2+d38bec5d
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JSONSerializer Class

⚠️ This is LEGACY documentation for a feature that is no longer encouraged to be used. If starting a new app or thinking of implementing a new adapter, consider writing a Handler instead to be used with the RequestManager

In EmberData a Serializer is used to serialize and deserialize records when they are transferred in and out of an external source. This process involves normalizing property names, transforming attribute values and serializing relationships.

By default, EmberData uses and recommends the JSONAPISerializer.

JSONSerializer is useful for simpler or legacy backends that may not support the http://jsonapi.org/ spec.

For example, given the following User model and JSON payload:

import Model, { attr, belongsTo, hasMany } from '@ember-data/model';

export default class UserModel extends Model {
  @hasMany('user') friends;
  @belongsTo('location') house;

  @attr('string') name;
}
{
  id: 1,
  name: 'Sebastian',
  friends: [3, 4],
  links: {
    house: '/houses/lefkada'
  }
}

JSONSerializer will normalize the JSON payload to the JSON API format that the Ember Data store expects.

You can customize how JSONSerializer processes its payload by passing options in the attrs hash or by subclassing the JSONSerializer and overriding hooks:

  • To customize how a single record is normalized, use the normalize hook.
  • To customize how JSONSerializer normalizes the whole server response, use the normalizeResponse hook.
  • To customize how JSONSerializer normalizes a specific response from the server, use one of the many specific normalizeResponse hooks.
  • To customize how JSONSerializer normalizes your id, attributes or relationships, use the extractId, extractAttributes and extractRelationships hooks.

The JSONSerializer normalization process follows these steps:

  1. normalizeResponse
    • entry method to the serializer.
  2. normalizeCreateRecordResponse
    • a normalizeResponse for a specific operation is called.
  3. normalizeSingleResponse|normalizeArrayResponse
    • for methods like createRecord we expect a single record back, while for methods like findAll we expect multiple records back.
  4. normalize
    • normalizeArrayResponse iterates and calls normalize for each of its records while normalizeSingle calls it once. This is the method you most likely want to subclass.
  5. extractId | extractAttributes | extractRelationships
    • normalize delegates to these methods to turn the record payload into the JSON API format.

Methods

_canSerialize

(
  • key
)
Boolean private

Check attrs.key.serialize property to inform if the key can be serialized

Parameters:

  • key String

Returns:

Boolean:

true if the key can be serialized

_getMappedKey

(
  • key
)
String private

Looks up the property key that was set by the custom attr mapping passed to the serializer.

Parameters:

  • key String

Returns:

String:

key

_mustSerialize

(
  • key
)
Boolean private

When attrs.key.serialize is set to true then it takes priority over the other checks and the related attribute/relationship will be serialized

Parameters:

  • key String

Returns:

Boolean:

true if the key must be serialized

_normalizeResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
  • isSingle
)
Object private

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String
  • isSingle Boolean

Returns:

Object:

JSON-API Document

applyTransforms

(
  • typeClass
  • data
)
Object private

Given a subclass of Model and a JSON object this method will iterate through each attribute of the Model and invoke the Transform#deserialize method on the matching property of the JSON object. This method is typically called after the serializer's normalize method.

Parameters:

  • typeClass Model
  • data Object

    The data to transform

Returns:

Object:

data The transformed data object

extractAttributes

(
  • modelClass
  • resourceHash
)
Object public

Returns the resource's attributes formatted as a JSON-API "attributes object".

http://jsonapi.org/format/#document-resource-object-attributes

Parameters:

  • modelClass Object
  • resourceHash Object

Returns:

Object:

extractErrors

(
  • store
  • typeClass
  • payload
  • id
)
Object public

extractErrors is used to extract model errors when a call to Model#save fails with an InvalidError. By default Ember Data expects error information to be located on the errors property of the payload object.

This serializer expects this errors object to be an Array similar to the following, compliant with the https://jsonapi.org/format/#errors specification:

{
  "errors": [
    {
      "detail": "This username is already taken!",
      "source": {
        "pointer": "data/attributes/username"
      }
    }, {
      "detail": "Doesn't look like a valid email.",
      "source": {
        "pointer": "data/attributes/email"
      }
    }
  ]
}

The key detail provides a textual description of the problem. Alternatively, the key title can be used for the same purpose.

The nested keys source.pointer detail which specific element of the request data was invalid.

Note that JSON-API also allows for object-level errors to be placed in an object with pointer data, signifying that the problem cannot be traced to a specific attribute:

{
  "errors": [
    {
      "detail": "Some generic non property error message",
      "source": {
        "pointer": "data"
      }
    }
  ]
}

When turn into a Errors object, you can read these errors through the property base:

{{#each @model.errors.base as |error|}}
  <div class="error">
    {{error.message}}
  </div>
{{/each}}

Example of alternative implementation, overriding the default behavior to deal with a different format of errors:

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  extractErrors(store, typeClass, payload, id) {
    if (payload && typeof payload === 'object' && payload._problems) {
      payload = payload._problems;
      this.normalizeErrors(typeClass, payload);
    }
    return payload;
  }
}

Parameters:

  • store Store
  • typeClass Model
  • payload Object
  • id (String | Number)

Returns:

Object:

json The deserialized errors

extractId

(
  • modelClass
  • resourceHash
)
String public

Returns the resource's ID.

Parameters:

  • modelClass Object
  • resourceHash Object

Returns:

String:

extractMeta

(
  • store
  • modelClass
  • payload
)
public

extractMeta is used to deserialize any meta information in the adapter payload. By default Ember Data expects meta information to be located on the meta property of the payload object.

Example

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  extractMeta(store, typeClass, payload) {
    if (payload && payload.hasOwnProperty('_pagination')) {
      let meta = payload._pagination;
      delete payload._pagination;
      return meta;
    }
  }
}

Parameters:

extractPolymorphicRelationship

(
  • relationshipModelName
  • relationshipHash
  • relationshipOptions
)
Object public

Returns a polymorphic relationship formatted as a JSON-API "relationship object".

http://jsonapi.org/format/#document-resource-object-relationships

relationshipOptions is a hash which contains more information about the polymorphic relationship which should be extracted:

  • resourceHash complete hash of the resource the relationship should be extracted from
  • relationshipKey key under which the value for the relationship is extracted from the resourceHash
  • relationshipMeta meta information about the relationship

Parameters:

  • relationshipModelName Object
  • relationshipHash Object
  • relationshipOptions Object

Returns:

Object:

extractRelationship

(
  • relationshipModelName
  • relationshipHash
)
Object public

Returns a relationship formatted as a JSON-API "relationship object".

http://jsonapi.org/format/#document-resource-object-relationships

Parameters:

  • relationshipModelName Object
  • relationshipHash Object

Returns:

Object:

extractRelationships

(
  • modelClass
  • resourceHash
)
Object public

Returns the resource's relationships formatted as a JSON-API "relationships object".

http://jsonapi.org/format/#document-resource-object-relationships

Parameters:

  • modelClass Object
  • resourceHash Object

Returns:

Object:

keyForAttribute

(
  • key
  • method
)
String public

keyForAttribute can be used to define rules for how to convert an attribute name in your model to a key in your JSON.

Example

import JSONSerializer from '@ember-data/serializer/json';
import { underscore } from '<app-name>/utils/string-utils';

export default class ApplicationSerializer extends JSONSerializer {
  keyForAttribute(attr, method) {
    return underscore(attr).toUpperCase();
  }
}

Parameters:

  • key String
  • method String

Returns:

String:

normalized key

keyForRelationship

(
  • key
  • typeClass
  • method
)
String public

keyForRelationship can be used to define a custom key when serializing and deserializing relationship properties. By default JSONSerializer does not provide an implementation of this method.

Example

import JSONSerializer from '@ember-data/serializer/json';
import { underscore } from '<app-name>/utils/string-utils';

export default class PostSerializer extends JSONSerializer {
  keyForRelationship(key, relationship, method) {
    return rel_${underscore(key)};
  }
}

Parameters:

  • key String
  • typeClass String
  • method String

Returns:

String:

normalized key

modelNameFromPayloadKey

(
  • key
)
String public

Dasherizes the model name in the payload

Parameters:

  • key String

Returns:

String:

the model's modelName

normalize

(
  • typeClass
  • hash
)
Object public

Inherited from Serializer but overwritten in ../packages/serializer/src/json.js:562

Normalizes a part of the JSON payload returned by the server. You should override this method, munge the hash and call super if you have generic normalization to do.

It takes the type of the record that is being normalized (as a Model class), the property where the hash was originally found, and the hash to normalize.

You can use this method, for example, to normalize underscored keys to camelized or other general-purpose normalizations.

Example

import JSONSerializer from '@ember-data/serializer/json';
import { underscore } from '<app-name>/utils/string-utils';
import { get } from '@ember/object';

export default class ApplicationSerializer extends JSONSerializer {
  normalize(typeClass, hash) {
    let fields = typeClass.fields;

    fields.forEach(function(type, field) {
      let payloadField = underscore(field);
      if (field === payloadField) { return; }

      hash[field] = hash[payloadField];
      delete hash[payloadField];
    });

    return super.normalize(...arguments);
  }
}

Parameters:

  • typeClass Model
  • hash Object

Returns:

Object:

normalizeArrayResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:495

Available since 1.13.0

normalizeQueryResponse, normalizeFindManyResponse, and normalizeFindHasManyResponse delegate to this method by default.

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeCreateRecordResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:405

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is createRecord

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeDeleteRecordResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:423

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is deleteRecord

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeFindAllResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:315

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is findAll

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeFindBelongsToResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:333

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is findBelongsTo

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeFindHasManyResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:351

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is findHasMany

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeFindManyResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:369

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is findMany

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeFindRecordResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:279

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is findRecord

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeQueryRecordResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:297

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is queryRecord

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeQueryResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:387

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is query

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeRelationships

() private

normalizeResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Inherited from Serializer but overwritten in ../packages/serializer/src/json.js:218

Available since 1.13.0

The normalizeResponse method is used to normalize a payload from the server to a JSON-API Document.

http://jsonapi.org/format/#document-structure

This method delegates to a more specific normalize method based on the requestType.

To override this method with a custom one, make sure to call return super.normalizeResponse(store, primaryModelClass, payload, id, requestType) with your pre-processed data.

Here's an example of using normalizeResponse manually:

socket.on('message', function(message) {
  let data = message.data;
  let modelClass = store.modelFor(data.modelName);
  let serializer = store.serializerFor(data.modelName);
  let normalized = serializer.normalizeSingleResponse(store, modelClass, data, data.id);

  store.push(normalized);
});

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeSaveResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:459

Available since 1.13.0

normalizeUpdateRecordResponse, normalizeCreateRecordResponse and normalizeDeleteRecordResponse delegate to this method by default.

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeSingleResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:477

Available since 1.13.0

normalizeQueryResponse and normalizeFindRecordResponse delegate to this method by default.

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeUpdateRecordResponse

(
  • store
  • primaryModelClass
  • payload
  • id
  • requestType
)
Object public

Defined in ../packages/serializer/src/json.js:441

Available since 1.13.0

Called by the default normalizeResponse implementation when the type of request is updateRecord

Parameters:

  • store Store
  • primaryModelClass Model
  • payload Object
  • id String | Number
  • requestType String

Returns:

Object:

JSON-API Document

normalizeUsingDeclaredMapping

() private

serialize

(
  • snapshot
  • options
)
Object public

Inherited from Serializer but overwritten in ../packages/serializer/src/json.js:958

Called when a record is saved in order to convert the record into JSON.

By default, it creates a JSON object with a key for each attribute and belongsTo relationship.

For example, consider this model:

import Model, { attr, belongsTo } from '@ember-data/model';

export default class CommentModel extends Model {
  @attr title;
  @attr body;

  @belongsTo('user') author;
}

The default serialization would create a JSON object like:

{
  "title": "Rails is unagi",
  "body": "Rails? Omakase? O_O",
  "author": 12
}

By default, attributes are passed through as-is, unless you specified an attribute type (attr('date')). If you specify a transform, the JavaScript value will be serialized when inserted into the JSON hash.

By default, belongs-to relationships are converted into IDs when inserted into the JSON hash.

IDs

serialize takes an options hash with a single option: includeId. If this option is true, serialize will, by default include the ID in the JSON object it builds.

The adapter passes in includeId: true when serializing a record for createRecord, but not for updateRecord.

Customization

Your server may expect a different JSON format than the built-in serialization format.

In that case, you can implement serialize yourself and return a JSON hash of your choosing.

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serialize(snapshot, options) {
    let json = {
      POST_TTL: snapshot.attr('title'),
      POST_BDY: snapshot.attr('body'),
      POST_CMS: snapshot.hasMany('comments', { ids: true })
    };

    if (options.includeId) {
      json.POST_ID_ = snapshot.id;
    }

    return json;
  }
}

Customizing an App-Wide Serializer

If you want to define a serializer for your entire application, you'll probably want to use eachAttribute and eachRelationship on the record.

import JSONSerializer from '@ember-data/serializer/json';
import { singularize } from '<app-name>/utils/string-utils';

export default class ApplicationSerializer extends JSONSerializer {
  serialize(snapshot, options) {
    let json = {};

    snapshot.eachAttribute((name) => {
      json[serverAttributeName(name)] = snapshot.attr(name);
    });

    snapshot.eachRelationship((name, relationship) => {
      if (relationship.kind === 'hasMany') {
        json[serverHasManyName(name)] = snapshot.hasMany(name, { ids: true });
      }
    });

    if (options.includeId) {
      json.ID_ = snapshot.id;
    }

    return json;
  }
}

function serverAttributeName(attribute) {
  return attribute.underscore().toUpperCase();
}

function serverHasManyName(name) {
  return serverAttributeName(singularize(name)) + "_IDS";
}

This serializer will generate JSON that looks like this:

{
  "TITLE": "Rails is omakase",
  "BODY": "Yep. Omakase.",
  "COMMENT_IDS": [ "1", "2", "3" ]
}

Tweaking the Default JSON

If you just want to do some small tweaks on the default JSON, you can call super.serialize first and make the tweaks on the returned JSON.

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serialize(snapshot, options) {
    let json = super.serialize(...arguments);

    json.subject = json.title;
    delete json.title;

    return json;
  }
}

Parameters:

Returns:

Object:

json

serializeAttribute

(
  • snapshot
  • json
  • key
  • attribute
)
public

serializeAttribute can be used to customize how attr properties are serialized

For example if you wanted to ensure all your attributes were always serialized as properties on an attributes object you could write:

import JSONSerializer from '@ember-data/serializer/json';

export default class ApplicationSerializer extends JSONSerializer {
  serializeAttribute(snapshot, json, key, attributes) {
    json.attributes = json.attributes || {};
    super.serializeAttribute(snapshot, json.attributes, key, attributes);
  }
}

Parameters:

  • snapshot Snapshot
  • json Object
  • key String
  • attribute Object

serializeBelongsTo

(
  • snapshot
  • json
  • relationship
)
public

serializeBelongsTo can be used to customize how belongsTo properties are serialized.

Example

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serializeBelongsTo(snapshot, json, relationship) {
    let key = relationship.name;
    let belongsTo = snapshot.belongsTo(key);

    key = this.keyForRelationship ? this.keyForRelationship(key, "belongsTo", "serialize") : key;

    json[key] = !belongsTo ? null : belongsTo.record.toJSON();
  }
}

Parameters:

  • snapshot Snapshot
  • json Object
  • relationship Object

serializeHasMany

(
  • snapshot
  • json
  • relationship
)
public

serializeHasMany can be used to customize how hasMany properties are serialized.

Example

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  serializeHasMany(snapshot, json, relationship) {
    let key = relationship.name;
    if (key === 'comments') {
      return;
    } else {
      super.serializeHasMany(...arguments);
    }
  }
}

Parameters:

  • snapshot Snapshot
  • json Object
  • relationship Object

serializeIntoHash

(
  • hash
  • typeClass
  • snapshot
  • options
)
public

You can use this method to customize how a serialized record is added to the complete JSON hash to be sent to the server. By default the JSON Serializer does not namespace the payload and just sends the raw serialized JSON object. If your server expects namespaced keys, you should consider using the RESTSerializer. Otherwise you can override this method to customize how the record is added to the hash. The hash property should be modified by reference.

For example, your server may expect underscored root objects.

import RESTSerializer from '@ember-data/serializer/rest';
import { decamelize } from '<app-name>/utils/string-utils';

export default class ApplicationSerializer extends RESTSerializer {
  serializeIntoHash(data, type, snapshot, options) {
    let root = decamelize(type.modelName);
    data[root] = this.serialize(snapshot, options);
  }
}

Parameters:

serializePolymorphicType

(
  • snapshot
  • json
  • relationship
)
public

You can use this method to customize how polymorphic objects are serialized. Objects are considered to be polymorphic if { polymorphic: true } is pass as the second argument to the belongsTo function.

Example

import JSONSerializer from '@ember-data/serializer/json';

export default class CommentSerializer extends JSONSerializer {
  serializePolymorphicType(snapshot, json, relationship) {
    let key = relationship.name;
    let belongsTo = snapshot.belongsTo(key);

    key = this.keyForAttribute ? this.keyForAttribute(key, 'serialize') : key;

    if (!belongsTo) {
      json[key + '_type'] = null;
    } else {
      json[key + '_type'] = belongsTo.modelName;
    }
  }
}

Parameters:

  • snapshot Snapshot
  • json Object
  • relationship Object

shouldSerializeHasMany

(
  • snapshot
  • key
  • relationship
)
Boolean public

Check if the given hasMany relationship should be serialized

By default only many-to-many and many-to-none relationships are serialized. This could be configured per relationship by Serializer's attrs object.

Parameters:

  • snapshot Snapshot
  • key String
  • relationship RelationshipSchema

Returns:

Boolean:

true if the hasMany relationship should be serialized

transformFor

(
  • attributeType
  • skipAssertion
)
Transform private

Parameters:

  • attributeType String
  • skipAssertion Boolean

Returns:

Transform:

transform

Properties

attrs

Object public

The attrs object can be used to declare a simple mapping between property names on Model records and payload keys in the serialized JSON object representing the record. An object with the property key can also be used to designate the attribute's key on the response payload.

Example

import Model, { attr } from '@ember-data/model';

export default class PersonModel extends Model {
  @attr('string') firstName;
  @attr('string') lastName;
  @attr('string') occupation;
  @attr('boolean') admin;
}
import JSONSerializer from '@ember-data/serializer/json';

export default class PersonSerializer extends JSONSerializer {
  attrs = {
    admin: 'is_admin',
    occupation: { key: 'career' }
  }
}

You can also remove attributes and relationships by setting the serialize key to false in your mapping object.

Example

import JSONSerializer from '@ember-data/serializer/json';

export default class PostSerializer extends JSONSerializer {
  attrs = {
    admin: { serialize: false },
    occupation: { key: 'career' }
  }
}

When serialized:

{
  "firstName": "Harry",
  "lastName": "Houdini",
  "career": "magician"
}

Note that the admin is now not included in the payload.

Setting serialize to true enforces serialization for hasMany relationships even if it's neither a many-to-many nor many-to-none relationship.

primaryKey

String public

The primaryKey is used when serializing and deserializing data. Ember Data always uses the id property to store the id of the record. The external source may not always follow this convention. In these cases it is useful to override the primaryKey property to match the primaryKey of your external store.

Example

import JSONSerializer from '@ember-data/serializer/json';

export default class ApplicationSerializer extends JSONSerializer {
  primaryKey = '_id'
}

Default: 'id'

store

Store public

The store property is the application's store that contains all records. It can be used to look up serializers for other model types that may be nested inside the payload response.

Example:

Serializer.extend({
  extractRelationship(relationshipModelName, relationshipHash) {
    let modelClass = this.store.modelFor(relationshipModelName);
    let relationshipSerializer = this.store.serializerFor(relationshipModelName);
    return relationshipSerializer.normalize(modelClass, relationshipHash);
  }
});